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So the races of the galaxy are, in the broad sense, more like dogs (many different breeds of Canis lupus familiaris but with the same basic gene sequencing and ability to produce fertile offspring) rather than different species genetically speaking? In essence, the race seen in TNG:"The Chase" is the wolf in this metaphor? The preceding unsigned comment was added by (talk).

They are more akin to the distant ancestor of wolves, foxes, coyotes, etc. They "seeded" the galaxy but many of their "offspring" species are quite different from one another after developing over billions of years. Human and Vulcan for example cannot interbreed naturally, and one assumes that goes for most species. All dogs can breed, and even dogs and coyotes, but not dogs and foxes. Bat'leth 01:25, September 27, 2011 (UTC)
The explanation for humanoid aliens is as ridiculous as the external structure of the Oberth class. All life on Earth has a direct bloodline to a common ancestor, without any sudden or alien evolution. Sure, there's punctuated equilibrium, but abandoning what went before and integrating something alien like that into the native ecosystem obviously never happened in Earth's history. Organisms eat organic molecules, so the precursor's DNA would just rot away. If anything like this happened, the precursor's DNA - like genes for arms and legs or whatever - would be found inside organisms that are too primitive to have any use for those genes. Yeah, organisms like humans for example have genes that don't do anything - but those genes used to do something more primitive, not more advanced. Also, the genes for your arm or leg or whatever are too specialized to encode a heartfelt holographic message for galactic peace - when was the last time you stuck a finger of one of your hands into a light-bulb socket and a finger of the other hand into your television signal socket and got an earless Salome Jens onscreen? That's right. NEVER. 04:40, November 22, 2011 (UTC)